[wp-trac] [WordPress Trac] #54356: Determine and apply best default quality settings for WebP images

[WordPress Trac]

#54356: Determine and apply best default quality settings for WebP images
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 Reporter:  adamsilverstein  |       Owner:  (none)
     Type:  enhancement      |      Status:  new
 Priority:  normal           |   Milestone:  Future Release
Component:  Media            |     Version:  5.8
 Severity:  normal           |  Resolution:
 Keywords:  needs-patch      |     Focuses:  performance
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Comment (by adamsilverstein):

 @mikeschroder - after your research on
 https://github.com/WordPress/performance/issues/7 and my own research on
 image formats, I would like to formally suggest we adjust the WebP
 compression quality default to 82, matching the value used for JPEGs. We
 can leave the filter in place so developers can still fine tune
 compression levels by MIME as they can now.

 My reasoning can be summarized as follows: WebP was/is developed
 **explicitly** to provide a smaller file size and similar image quality
 (across testing methodologies) as well as compression resource consumption
 ''at the same quality setting''. Since we already chose 82 for JPEG, we
 should use the same for WebP.

 Choosing this value will give WebP generation the most consistently
 improved performance profile vs. JPEG, though of course individual image
 results will vary depending on a wide range of factors including image
 type, quality and size

 Worth noting that this ticket was opened based on discussion on the
 [https://core.trac.wordpress.org/ticket/35725 original ticket adding WebP
 support], however I couldn't track down why we chose the current default
 of 86 for WebPs.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54356#comment:8>
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